Burner



1925 3 Sheets-Sheet l BURNER WALLSTROM Filed July 28.

June 15 1926.

June 15 1926. 1,588,634

r l.. WALLSTROM BURNER Filed July 28, 1925 3 Sheets-Sheet 2 Sworn,

June 15 1926. 1,588,634

- l.. wALLsTRoM BURNER Filed July-28. 1925 3 Sheets-Sheet 5 L adm?? WMZ 5 fm2/Z) Patented June 15, 1926.

UNITED STATES PATENT OFFICE.

LUDWIG WALLvSTROM, OF LIMA, PERU.

BURNER.

Application filed July 28, 1925. Serial No. 46,634, and in Peru April 8, 1925.

I to the liquid fuel. The purpose of the inveution. generally stated, is to provide a burner in which itis possible to effect a nicer adjustment than has been possiblel heretofore. so as to obtain, under readily controllable conditions, the highest value of combustion from the oils, and a flame of whatever length may be desired. The burner is particularly designed for use 1n producing steam and for heating purposes either ou shipboard or land, besides for metallurgie and calcination purposes.

My invention resides in the characteristics, constructions and combinations of elements indicated in the appendant claims.

ln the accompanying drawingsz- Figure 1 is a longitudinal section of an oil burner constructed in accordance with my invention. y

'Figure 2 and 4 are a fragmentary longitudinal section of a modified form of the same burner.

Figure 3 is an enlarged sectional view of the rear portion of Fig. 1, showing how a valve stem is positioned.

Figs. and 6 are fragmentary elevations, partly in section, of the ends of burner tubes in which no valve stems are provided.

Fig. 7 is a section partly in elevation through a cam and associated mechanism of Fig. 4 for shifting the burner tubes.

Referring to Figures 1 and 3. the casing for they 'burner comprises an elbow 1 into which is threaded a sleeve 2. The latter is connected to the nozzle 3, by means of clamping bolts and interposed, spacing rings 4, whereby the length of the nozzle may be varied. A stationary air conduit 5 leads to the lower opening in elbow 1. The burner may be, and preferably is, supported by means of the stationary conduit. Air is supplied by a simple ventilator or fan, standing at a pressure of from 6 to 10 inches of water.

Two telescoping tubes 6 and 7 extend' centrally through the nozzle and the horizontal turn of the elbow, and pass through the rear vertical wall of the latter. The annular space between the outer tube 6 and the inner tube 7 constitutes a fuel passageway. Within the tube 7 is a. rod 8 which carries at one end a valve 9. AA plate 10 is secured to the end of tube 7 and provides two valve seats 11 and 12, the former cooperating with valve 9 and the latter with a sleeve 'I 13 securedv to tube 6. A'ring 14 having an inner conical surface 15 surrounds the atomizer or plate 10, and is held slightly spaced from the inner wall of nozzle 3 by supporting pins 16, preferably three in number.

An interiorly threaded bushing 17 receiving pipe sections 18 and 19 is clamped in an opening in the sleeve 2, the joints being properly packed as shown. The upper end of pipe section 19 is received in the four-way joint 20, through which extend the tubes 6 and 7 and the valve stem 8. The

outer tube is adapted to slide through the joint 20 as will be described presently, and packing is provided between it and the tube. Further on tube 6 is provided with slots, and one of these serves as registering slot through which passes a pin 21 secured to the joint.

21, to facilitate the commingling of oil. and y air if operation is stopped` oil being supplied, under a simple gravity pressure at a height .of 10 to 16 feet maximum througha pipe 23 and the pipe sections 19 and 18, the latter containing a strainer 24.

Opposite the connection between the joint 20 and section 19, an elbow 25 is screwed into the joint. This elbow contains a cock 26, which is turned off during operation of the burner. When such operation is stopped the cock may be opened so as to blow air into the joint and the tubes to clear the latter of residue. Access to the cock is had through an opening in the top of sleeve 2, through which a tool may be inserted. During o eration, said opening is closed by a cap 2P?.

A peep hole is provided at the rear of elbow 1 and is adapted to be closed by a. plug 28.

, An opening is formed in the rear vertical.

wall of elbow 1 and the tubes 6, 7 and stem 8 pass therethrough, the tube 6 being exteriorly threaded some distance on each side In this way, rotation of the tube 6 f is prevented, while axial reciprocat-ion of of the opening. The outer wall of the elbow around the opening is receed and receives the hub 29 of a.- hand wheel'30 which is in- 4teriorly threaded to engage thel threads on tube 6. The hub 29 has a peri heral groove 31 receiving the semicircular edglof a plate 32 fastened to the wall of the el w, so that by turning the wheel 30, the tube 6 (and with it the tube 7 and stem 8, as will be explained) will be axially shifted, said wheel being held against axial movement by the elbow and the plate 32. i

'A sleeve 33 is threaded on the end of .tube 6 and. firmly securedin place, as by means of a set screw. Thls' sleeve may be provided with two scales, which may be engraved on the sleeve itself or provided on a plate or platee secured to the sleeve. vOne scale is numbered from 0 to 7; the other In line with each numeral of the scale, I preferably provide a. groove or ridge encircling the sleeve (see Fig. 2). The grip portion of the hand wheel has a number of radial, inwardly directed pointers 34 to cooperate with the scales or grooves on sleeve 33. As the wheel is turned, the tube 6 and sleeve 33 are moved backward or forward, and the location of the tube is indicated by the inters and the scale which is beingl Y The sleeve 33 has, at the end of tube 6, an inner flange, nicely fitting aroundthe inner tube 7, and between which and the end of tube 6 I rovide packing 35. The `rear part of the sleeve is enlarged and interiorly vthreaded to receive a gland 36, holding in lace additional for the tubes. p The rear end of tube 7 is threaded and receives a nut 36 having a peripheral groove and locked in place by a jam nut 37. `A diaa metrically spht ring 38 fits into said groove vand is fastened to the hub of a handle 39. The hub is threaded on the extreme end of sleeve 33, so that by turning handle 39, the inner tube is shifted relatively to the outer tube. Thel sleeve 33 has a flange 40 whose surface is notched and engaged by a spring catch 41 secured to the handle, whereby the latter may be latched in any desired ition of adjustment. I prefer to provide numerals beside the notches on flan 40, to indicate the relative y ition of tu 6 and 7 and consequently t e micrometrical extent l of opening of valve 12 for the supply of oil.

A joint 42 is screwed on the extreme end of tube 7 and has a nipple 43 to receive a hose or other llexible conduit communicating with a source of air under pressure. The valve stem 8 is packed by a gland 44 in the joint, and the extreme end of the stem is threaded. A. wheel 45 is threaded on the end of the 'oint and carries a retaining pin 46, which bears on the surface of the joint 42. Said wheel has an inner flange 47 while the threaded end of the valve stem restem. 'tlhen sleeve 48 lis screwed on until the spring forces valve 9 against its seat.

Next, the nut 51 is threadedV on the end of 48. Finally, the valve stem is pressed inwardly and the halves of ring 50 are secured into place by being screwed onto wheel 45,

with the flange 52 fitting into the groove in the ring. The parts are so adjusted that the sleeve 48 engages the front face of ring the valve stem until it jams against sleeve 50 while the flange 52 engages the rear wall of its groove. The latter' is so much wider than the flange -52 that the valve stem is permitted a little axial play against theac- Vtion of spring 49. The clearanceV is illus- -trated in the enlarged vshowing of Fig. 3. I prefer to provide numerals beside the notches on the surface of the joint 42, to indicate how the valve 9 is adjusted relatively to the valve seat 11. Consequently the micrometrical extent of opening of flat valve 9, controls the supply of extra gases, which might be of oxygen alone, or combined with air, and injected in the center of the flame projected from the annular space between plate'lO and ring 14. In this way I avoid having to supply an excess of airv to said annular space, and can, within -reasonable limits, control the form and size of the flame.v Referring now to the conical ring 14 and the atomizer 10, it is to be noted that the diameter of the latter is as great or almost as great as the smallest internal diameter of the ring. When the atomizer is at the extreme right, the largest annular opening is provided between the atomizer and the ring, and the scale 7 to 0 on sleeve 33 is used, the pointer 34 standing at' 7. ,It is to be plainly understood that my invention is not limited to sizes or proportions, but I wish to set forth certain preferred measurements. The atomizer is 3 inches in diameter and the maximum clearance between it and the ring 14 is 5/8 inch. The tube and valve stem can vmove through the joint 20 a maximum distancewof 7/8 inch. As shown in Fig. 1, the parts are set for a flame of the maximum length, say, with proper coordination of oil and air, about 4 eet. vAs the atomizer is retracted into the nozzle the flame shrinks to a minimum of say one foot. In adjusting the burner, the hand-wheel 30 is first turned until the l between the two tubes.

l with solid D out the tubes.

atomizer 10 is properly positioned, relative to the ring 14, as shown by the scale or Scor.- ings on sleeve 33. Then the handle 39 is turned to obtain an opening of proper size Finally Figs. 4 and 6 show how the burner can dispense with hand-wheel 45 and valve stem 8, in this condition the tube 7 is now empty, for a supply of air alone, or combined, if desired, with D different solid fuels in pulverulent form which may be injected with the air through joint 42 or nipple-nut 57 (Fig. 6), and air through the nipple 58; the opening 59 serves' for cleanin etc. But the latter operation uels may not be for firing purposes.

In the modified structure shown in Fig. 4, the burner is designed to produce a flame which, at its shortest, is about as long as the shortest flame produced by the burner of Fig. 1, but which may have a maximum length in this case of 8 feet or more.

In Figure 2, the ring 14 is smaller than the ring in Fig. 1, and the atomizer is of only about two-thirds the diameter of the atomizer in Fig. 1. Between the ring 14 and the inner wall of the nozzle 3 a fixed ring 53 is provided, and the pins 16 are elongated to pass through said ring andenn gage the ring 14. The position of the latter is reversed relatively to Fig. 1, and the, pointers 34 cooperate with the scale 0 to 7.` The manner of relatively adjusting the two tubes is the same in Fig. 2 as in Fig. 1, but

f in Fig. 2 I have shown the valve stem 8 as provided with a needle valve 54 instead of the conical valve 9. Therefore the valve stem must be moved rearwardly to open the valve, instead of forwardly as in Fig. 1, and. in conse uencev of this the sleeve 48 within the han -wheel is reversed in posit-ion, and the inner flange 47 of the hand-wheel vis omitted, so that the rear end of the spring 49 bears against the ring 50 while its for- 5 ward end bears against the flange on sleeve 48. Complete closing of the valve is prevented, as in Fig. 1, by the flange ,52 on nut 51 cooperating with lthe groove in ring 50, but in Fig. 2 the spring 49 causes the flange D 52 to bear against the forward wall of the groove in ring 50.

In Fig. 2 I provide for clearing out the tubes, after the burner ceases to operate, by means of steam. To this end, the up er 5 opening of the joint 20 is connected wit a.

pipe 55 passing through the sleeve 2, and closed by a cap 56 when the burner is in operation. This pipe may be connected with a steam inlet pipe when it is desired to clear In the modified structure shown in Figs. 4 and 7, I dispense with thehand wheel 30 and rovide means for extremely speedy shiftmg of the two tubes 6 and 7. An angle 5 bracket 61 is bolted to the elbow 1, and provides a bearing 62 for vertical shaft which has an eccentric portion receiving an antifriction cam ring 63. This ring is h eld in place between a lower shoulder 63a on the shaft and its eccentric part and an upper plate 63b secured to the shaft. The latter also has secured to it a spring whose free end carries a pin adapted*` to travelin an arcuate slot on the horizontal surface of bracket 61. Numerals may be inscribed Aon the bracket beside the slot to indicate the adjusted position occupied by the'tubes. handle 66 is secured .to the lower end of the shaft, to operate the cam 63, which projects between the shoulders 64* of a sleeve 64, secured to the tube 6 in lieu of the sleeve 33 of Fig. 1. A bolt 67 depending from spring 60 passes through an arcuate slot in the bracket 61 and receives a nut 68, which,

when tightened, locks the tubesin any desired position of adjustment.

The joint'42 on tube 7 may be used to supply air only, through nipple 69 and nut 70, or it may be used to supply air and also extra gases,.tl1e latter throu h a second nipple 75. Said nipple isfagapted to receive a gas-supply. hose, and is preferably adapted to receive interiorly one of a number of steel plates. One' of the plates may be imperforate so as to obstruct completely any passage through the nipple, and the others may have holes of varying diameters, so as to admit more or less gas under pressure. The opening 71 in the nipple is for observation and contains a glass. f

And finally Fig. 5 shows a burner without employin the central rod 8, and which.

' said rin Ybeing reversible in said nozzle 3. A urner in accordance with claim 1 in which the deflector spherical rear surface.

4. A burner in accordance with claim 1, in which the deflector plate is mounted on the inner tube, providing a valve inlet between it and the outer tube.

5. A burner in accordance with claim 1,

in which the valvestem is mounted for slight longitudinal play: against the tension of a a conical inplate vhas a partly spring. j n

6. burner compmsm a casing having a nozzle, telescoping, re atively adjustable tubes extending through the casing to the nozzle, a deflector plate supported on one of the tubes and adapted t0 cooperate with the nozzle, means for admitting fuel to the space between the tubes, said means being rigid with the casing and serving to support the tubes, a device for restraining the tubes from rotation while permitting them to move axg ially through such support, means for adj usttubes, the casing having an opening which is normally closed but adapted to be opened to render available the means for admitting the cleaning medium.

9. A burner in accordance with claim 1, in which .the ring surrounding the atomizer has a minimum diameter approximately equal to the maximum diameter of the atomizer, whereby movement of the atomizer axially of the ring varies the extent of the clearance therebetween.

`10. A burner comprising nested tubes affording fuel passageways and providing atomizing means at their outlet ends, a deflector plate supported by and surrounding the atomizing means, a cooperating ring havin a conical inner surface surrounding the de- Hector plate, means for adjusting at leastone of the tubes with respect to said ring, and a nozzle surrounding and supporting the ring, which is reversible in said nozzle and has an axial length substantially equal to the maximum distance through which the tubes are adjustable.

11. A burner comprising nested tubes aflording fuel passageways and providing atextent of annular clearance therebetween. i

12. A burner according to `claim 6. having a ring provided with a conical inner surface cooperating with the deector plate and mounted in the nozzle about the ends of the tubes, said ring being reversible .in said nozzle and having an axial length substantially equal to the maximum distance through which the tubes are adjustable.

13. A burner according to claim 1, in which the valve is cone-shaped, and in which the deflector plate has a conical seat for the valve, the apex of the cone being directed against the direction of How through the inner tube.

In testimony whereof I affix my signature.

y LUDWIG WALLsTRoM, ING. 

